leayitt



2 Sheets-Sheet 1.

(No Model.)

P. M. LEAVITT.

DROP HAMMER.

INVENTOR I 1 ATTORNEY jatented Apr. 10, 1888.

Uiifl/ lllllllllllllll II WITNESSES: a

n. PETERS. Fhnlc-Ulhogriphor. wqlhingtai u. c

(No Model.)

2 Sheets--Sheet 2.

F. M. LEAVITT.

DROP HAMMER.

Patented Apr. 10, 1888.

WITNESSES ATTORNEY UNITED STATES PAT NT Orricn.

FRANK M. LEAVITT, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE E. \V.

' BLISS COMPANY, OF SAME PLACE.

DROP=HAMMER.

SPECIFICATION forming part of Letters Patent No. 380,808. dated April 10, 1888.

Application filed December 8, 1887. Serial No. 257,324.

To aZZ whom it may concern.-

Be it known that I, FRANK M. LEAVI'IT, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Drop-Hammer, of which the following is a full, clear, and exact description.

Prior to my invention hammers of the class to which this invention relates have been provided with flexible straps or with upwardlyextending wooden strips or boards, which straps,strips, or boards were clamped by revolvlng rollers when the hammer body was raised, the pressure upon the strap, strip, or board being thrown off when the hammer dropped; but such constructions are open to many objections, in that the straps, strips, or boards were constantly wearing out, and hence the machine had frequently to be stopped for repairs, and it frequently happened that the parts would give out, owing to inherent defects, and the operators hand would be injured by the premature falling of the hammer.

It is to overcome the above objections and at the same time to provide an improved form of drop hammer that I have designed the hammer forming the subject-matter of this specification, the invention consisting, essentially, of a pair of frictionrollers that are mounted in a plane, through which the body of the hammer travels when in operation, the rollers beingv arranged in connection with a mechanism by which they may be moved toward and from the side faces of the hammerbody, all as will be hereinafter more fully described, and specifically pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figurel is a front elevation of my improved drop-hammer. Fig. 2 is a side view, parts being broken away and parts being shown in section. Fig. 3 is a sectional detail view taken on line was of Fig. 1, and Fig. 4. is a sectional plan view taken on line 3 g of Fig. 3.

In the drawings I have represented the hammer-body 10 as being rectangular in crosssection, the angles, however, being cut away to form guiding-faces 2, which rest against corresponding faces 3, that are formed upon up- (No model.)

rights 11 at each side of the entrances to vertical recesses 12, which enter the bodies of the uprights; but any other proper form of hammer-body and any other proper form of guiding-ways could be employed without departing from the spirit of my invention.

The uprights 11 are secured to a base, 13, and this base also serves as the support for the lower die, 14, which die is adjusted to the re quired position by means of set-screws 15. The upper die, 16, is connected to the lower end of the hammer-body, and the heads ofthe set-screws 17, by which the die is heldin place, pass within the recesses 12 when the hammer is in operation.

At each side of the hammer-body I journal a centrally-divided cylindrical housing, 18, of which the bearings 19 are made integral with or rigidly connected to the uprights 11. The sections a and b of these housings are connected by a curved web or plate, 5, which plates also serve as guards, as will be presently explained.

Through the housings 18 I pass drivingshafts 20, which carry pulleys 21, the shafts, however, being so arranged that they will be eccentric to the axes of the housings.

Upon the exposed portions of the drivingshafts, between the sections a and b of the housings 18, beneath the guard-plates 5 and just opposite the hammenbody, I mount frictionrollers 22, said rollers being concentric with their shafts.

From the construction described it will be seen that if while the rollers 22 are revolving in the direction of the arrows shown in Fig. 2 the housings 18 be moved in corresponding directions the rollers will be brought to bear against the side faces of the hammer-body, and that said body will be raised, as indicated in Fig. 3.

Many forms of mechanism might be employed to move the housings as above set forth; but I consider the mechanism shown in the drawings one of the best for this purpose. The mechanism referred to consists'of atreadle,23,

' which, by means of a rod, 24, and links 25, is

connected to two heads, 26, the heads in turn being rigidly connected to the housings 18 by dowels 6 or by other proper connecting attachments. By this arrangement, when the outer end of the treadle is depressed the rod 24 will be raised and the housings turned, so as to carry the shafts 20, and consequently the rollers 22, toward the hammer-body to a position such that the rollers will bear against said body and carry it upward as they revolve; but when the pressure upon the treadle is relaXed the rollers will fall away and the hammer will drop.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. The combination, with a hammer-body mounted to slide in ways, of revoluble rollers movably mounted at the sides of theharnmerbody, substantially as shown and described.

2. The combination, with a hammer-body mounted to slide in ways, of revoluble rollers mounted at each side of the hammer-body,and a means for throwing said rollers toward said body, as and for the purpose stated.

3. The combination, with a hammer-body mounted to slide in ways, of revoluble rollers mounted in a plane through which the hammerbody travels,and a means for throwing the rollers toward the hammer-body, as and for the purpose stated.

4. The combination, with a hammer-body and its guides,of rollers, shafts upon which the rollers are mounted, housings through which the shafts are passed eccentrically, and a means for turning the housings, as and for the purpose stated.

5. The combination, with a hammer-body and its guides, of rollers mounted upon shafts at the sides of the hammer-body, housings through which the roller-shafts are passed eccentrically, atreadle, a rod connected thereto, links connected to the rod, and connections between the links and the housings, substantially as described. 

